Drain plug



May 23, 1944- c. E. HARTLEY' 2,349,425

DRAIN PLUG Filed Dec. 7, 1943 l2 vl-r' 4? j r g- Inventor Patented May23, 1944 UNITED STATES PATENT OFFICE DRAIN PLUG Clarence E. Hartley,Salisbury, N. 0., assignor of one-half to William T. Gurlie, Salisbury,N. 0.

Application December 7, 1943, Serial No. 513,315

the gasket H against the outer rim of the nip- 2 Claims.

My invention relates to improvements in drain plug for steam boilers,more particularly, the principal object in View being to provide a drainplug adapted to maintain a seal at a plurality of points therebyrendering the same absolutely leaf-proof, and which is adapted toobviate crossing of threads, is easy to install and adapted formanufacture at a low cost.

Other and subordinate objects are also comprehended by my invention, allof which, together with the precise nature of my improvements, will bereadily understood when the succeeding description and claims are readwith referenc to the drawing accompanying and forming part of thisspecification.

In said drawing:

Figure 1 is a view partly in side elevation and partly in sectionillustrating my improved drain plug installed,

Figure 2 is a view in front end elevation,

Figure 3 is a view in longitudinal section taken on the line 33 ofFigure 2 and drawn to an enlarged scale, and

Figure 4 is a View in transverse section taken on the line 44 of Figure3.

Referring to the drawing by numerals, my improved plug, as showntherein, comprises a tubular drain nipple I having an externallythreaded, tapered, rear end 2 for tapping into the wall 3 of a boiler,or the like, an externally threaded front end 4, an annular, internalgroove 5 intermediate its ends for containing a resilient gasket 6, andan enlarged bore, as at l, forwardly of the groove 5.

For closing the front end of the nippl I, an elongated, cylindrical capmember 8 is provided having an internally threaded socket end 9 to beturned onto the front end 4 of said nipple, an internal, annular andlarger groove Ill at the inner end of the socket concentric thereto andfor containing an annular resilient gasket I I designed to be compressedagainst the outer rim of the nipple I, and a wrench hold nub [2 on theend thereof opposite the socket end 9.

A cylindrical pilot member I3 is provided in the socket end 9 and whichfits in the enlarged bore 1 and is designed to bear against the gasket'6 when the member '8 is turned so as to compress ple I. The pilotmember [3 has a reduced, axial, front end shank M externally threadedand tapped into the body of said member 8, and a wrench hold nub l'5 onits rear end.

The closure member 8 is designed to be applied along With the pilotmember I3. As will be manifest, the described plug provides foreffectively sealing the nipple l. The pilot member l3 prevents thethreads of said connection from becoming crossed, in applying theclosure member 8, in a manner which will be clear, and as will furtherbe manifest, the entire structure is simple in form, easy to apply andinexpensive to manufacture.

The foregoing will, it is believed, suffice to impart a clearunderstanding of my invention without further explanation.

Manifestly, the invention, as described, in susceptible of modificationwithout departing from the inventive concept, and right is hereinreserved to such modifications as fall within the scope of the appendedclaims.

What I claim is:

1. A drain plug for boilers and the like comprising a nipple having anexternally threaded rear end for connection to a boiler, an externallythreaded front end, an annular internal groove therein intermediate saidends, and an enlarged bore forwardly of said groove, a gasket seated insaid groove, a cap member turned onto said front end, and a cylindricalpilot in said cap member fitting in said enlarged bore and bearingagainst said gasket.

2. A drain plug for boilers and th like comprising a nipple having anexternally threaded rear end for connection to a boiler, an externallythreaded front end, an annular internal groove therein intermediate saidends, and an enlarged bore forwardly of said groove, a gasket seated insaid groove, a cap member turned onto said front end, and a cylindricalpilot in said cap member fitting in said enlarged bore and bearingagainst said gasket, said cap member being provided with an annularinternal groove surrounding the rim of said front end, and a gasket insaid second groove bearing against said rim.

CLARENCE E. HARTLEY.

